One more major HDMI feature that bears mention is the HDMI Ethernet Channel. The HDMI Ethernet Channel is a method by which internet connectivity can be shared between properly equipped devices, without the use of additional wires. For example, if your blu-ray player is connected to the internet, your television can also be connected through an HDMI Cable With Ethernet.
As with the Audio Return Channel, all the equipment and devices must specifically be designed to process the HDMI Ethernet Channel. Unlike the Audio Return Channel, normal Standard and High Speed HDMI Cables are not capable of carrying the Ethernet signal - you must use Standard or High Speed HDMI Cables With Ethernet.
With many devices now equipped with wireless network adapters, the usefulness of the HDMI Ethernet Channel is somewhat diminished. However, a wired Ethernet connection can produce greater speeds and throughput, so the HDMI Ethernet Channel is worth using if your equipment supports it.
(Credit Monoprice website for info)